Veeam Endpoint Backup is a free product. You do not need to obtain or install any license to use it.
When you install Veeam Endpoint Backup, you must accept the terms of the product license agreement. To view the license agreement, click the Veeam End User License Agreement link in the installation window or visit Veeam website at: www.veeam.com/eula.html.
Integration with Veeam Backup & Replication
If you plan to use Veeam Endpoint Backup with Veeam Backup & Replication, you must install on the Veeam backup server a license for Veeam Backup & Replication Standard Edition or higher.